"Sharks 3D": This time, it's three-dimensional. Jean-Michael Cousteau presents a 42-minute 3D IMAX film about those evolutionary masters of the undersea food-chain, sharks. Or, as the ads say, "the lions and tigers of the ocean" -- except they don't have claws or fur and are not feline and they like the water. At any rate, one is bound to recall the immortal words of Roy Scheider: "We're gonna need a bigger boat." -- je